METHOD OF PROTECTING FDM PRINTED PRODUCTS BASED ON THE PHASE SHIFT OF THE SURFACE LAYER
P. A. Tomashaytis, V. A. Fedoseev, V. E. Bykov, D. A. Shapiro
Samara National Research University, Samara, Russia
Keywords: 3D printing, product protection, digital watermark, vector graphics, G-code, spectral analysis
Abstract
The paper proposes a method for protecting 3D printed products made using the FDM technology from unauthorized copying. This method is based on the controlled deviation of the trajectory of filament application on a flat section of the surface layer of the product. The amount of deviation of the line trajectory is determined by the built-in security mark, which plays the role of a watermark. Changes made in this way are difficult to detect visually and even more difficult to automatically read when scanning the shape of a 3D product and subsequently reproduce it when creating its copy. In this case, verification of the authenticity of a product by detecting a security mark can be performed by shooting the product with a digital camera and specialized processing based on spectral analysis and narrow-band filtering.
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